[SADXA] Terminator Speed at HEARD and DAYLIGHT Propagaion Distance of Greyline, after Sunrise

[Jerry]

I fell asleep:-)

On 4/6/2016 12:57 PM, Wes wrote:
> A suggestion that before getting too wound up about this, a look at 
> this presentation might be "illuminating."
>
> http://wwrof.org/webinar-archive/a-long-overdue-review-of-gray-line-propagation-on-the-low-bands-by-carl-luetzelschwab-k9la/ 
>
>
> On 4/6/2016 9:22 AM, W7EXG (Bill) wrote:
>> The Earth's Terminator Speed at HEARD is 623 mi/hr at -53 deg latitude.
>>
>> Since on 4/5 AZ time, VK0EK's signal was heard 2 hrs and 25 min. AFTER
>> VK0EK's SUNRISE, the GREYLINE daylight propagation path DISTANCE AFTER
>> SUNRISE (distance from Heard to westward moving Terminator) was 1505 
>> miles.
>>   This is an amazing distance, for a 40m signal to propagate in 
>> daylight,
>> just to travel to the actual Greyline boundary [not to mention the 
>> 11,000
>> miles around the world to Tucson].
>>
>> I guess it really doesn't come as a surprise to many,  based on the 
>> Easterly
>> Stations still heard on 40m at Sunrise.
>>
>> To me, all this strongly suggests the D layer is slow to materialize 
>> after
>> sunrise.. It is well known, the D layer quickly dissipates AFTER SUNSET.
>>
>> The reason I find this important for DX chasers, is this data 
>> suggests the
>> actual propagation BAND of the Greyline, appears to be well over a 1000
>> miles on the SUNRISE side of the Earth's visible light terminator.
>>
>> This might have value to some, in planning a GREYLINE DX target 
>> timeframe
>> window.
>>
>> 73s,
>>
>> Bill W7EXG
>>
>>
>>
>>
>
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